Liquid metering device



Oct. 2, 1945. T. A. BAKER LIQUID :METERING DEVICE 2 Sheets-Sheet 1 Original Filed May 12-, 1942 INVENTOR. 720,445 ,4 5446 Oct. 2, v1'945. A. BAKE R 2,385,784

7 LIQUID METERING DEVICE 2 Sheets-Sheet 2 Original Filed May 12, 1942 INVENTOR. filo/745 4. BMQ BY Patented Oct. 2, 1945 LIQUID METERING DEVICE Thomas a. Baker, Logansport, Ind.

Orin.

al application May 12, 1942, Serial No.

442,711. Divided and this application December 24, 1942, Serial No. 470,015

13 Claims.

This application is a division oi. my application,

Serial No. 442,711, flied May 12, 1942, for Fluid measuring and regulating mechanism, and relates in general to a fluid metering device and more particularly to a. liquid metering device which measures the quantity oi liquid delivered as determined by a predetermined setting.

Although my invention will be described with the provision of maintaining the how of the liquid in a liquid passage at a predetermined value or settng, it is to be understood that it may be applied to govern the operation of any other condition.

An object of my invention is the provision of measuring the quantity oi liquid delivered through a iiow duct passage.

Another object of my invention is the provision of measuring the quantity of liquid which flows through a liquidduct passage and of maintaining the flow of liquid through the liquidduct passage at a predetermined value or setting.

'Another object or my invention is the provision of a liquid metering device having a plurality of variable volume chambers for ejecting the liquid, whereby the amount of liquid elected may be gov erned by changing the capacity oi the chambers.

Another object of my invention-is the provision of a liquid metering device which may be set at any predetermined value for determining the X quantity of liquid to be delivered by the said device.

Another object of my invention is the provision of controlling the flow of liquid fuel to an internal combustion engine.

Another object 01' my invention is the provision of transmitting a movement which is responsive to the iiow 0! liquid throug a conduit to a liquid mitting means which is adapted to control the quantity of the liquid flowing through the liquid duct passage;

Figure 2 is a front view of a movable metering plate arranged to govern the quantity of liquid passing through the liquid metering device;.

Figure 3 is a perspective and partially crosssectional view of a cam race-way employed in my liquid metering device;

Figure 4 is a side view 01' the cam race-way shown in Figure 8;

Figure 5 is a crosssectional view oi a valve for controlling the fluid in my motion transmitting means;

Figure 8 is an end view showing the angular relationship between the valve plunger and the valve casing taken along the line 0-! of Figure 5 with the outside casing removed;

Figure 7 is a view 01' the valve shown in Figure 5 but looking down thereon;

Figure 8 is a view similar to Figure 5 but shows the" plunger within the valve turned in a counterclockwise direction for substantially degrees;

Figure 9 is a cross-sectional view taken along the line 0-4 of Figure 8 with the outer casing removed; y

Figure 10 is a view of the position, of the valve shown in Figure 8 but looking down thereupon;

Figure 11 is a view similar to Figure 5 but with the inner casing rotated substantially 90 degrees in a clockwise direction;

Figure 12 is a cross-sectional view of Figure 11 taken along the line i2-l2 with the outer casing removed;

Figure 13 is a cross-sectional view oi the valve shown in Figure 11 but looking down thereupon;

Figure 14 is a perspective and cross-sectional view or the valve shown in Figures 5 to 14 inclusive.

The liquid or fuel which is delivered to the internal combustion engine 33 through the supply conduit I4 is fed by a pump Bl from a supply tank I. In Figure 1 of the drawings only one cylinder of the internal combustion engine is. 11- lustrated and it. is to be understood that the other cylinders of the engine are supplied with fuel. The fuel upon leaving the pump passes through a venturi 2" and then into a liquid metering or measuring device indicated. generally by the reference character It, after which the measured liquid is supplied to, the cylinder 33 through a supply duct '4. Although only one outlet II is illustrated for the liquid metering device, it is tdbe understood that the liquid metering device has as many outlets as there are cylinders in the e'rfgine to be supplied. Theliquid metering de-' vice II and the pump Il may bedriven by a common source--91 motive power indicated generally IOI. The liquidby the reference character metering device 53 is capable of having a variable volume delivery which governs the flow of the amount of fluid to the cylinders of the internal combustion engine. 'I'he variable volume delivery of the liquid metering device is'controlled by a motion transmittin means 220 which in turn is responsive to two opposingpressure bellows I" and I", each being respectively respon sive to the low and high pressure condition at theventuri 280. Themotion transmitting means 220 is governed by the throttle device 88 driving the gear I'll. Consequently, the combined action of the liquid metering device 58 and the motion transmitting means 228 provid for maintaining the flow oi fluid to the cylinder 33 of the predetermined value or quantity as governed by the setting of the throttle 38. d

, The liquid metering device 53 comprises a housing 28I which is supplied by liquid fuel from the pump 58 through a feed pipe 259. Within v the housing 28| there are arranged a plurality of which govern the amount of fluid delivered to the internal combustion engine through the conduit 54. The valve-like piston 284 comprises a valve 288 having a stem 288 and a valve sleeve 281 on 1 the outside of the valve stem 288. Each of the valve sleeves 281 is provided with a longitudinal duct 288 to direct fuel into the left-hand end of I the cylinders 282.

In addition, fluid may flow into the cylinder 282 through longitudinal ducts 288 passing through the internal body part of the liquid metering device. The fluid which flows through the longitudinal ducts 288 is required to pass by ball check valves 218 before entering the cylinders 282. The fluid which is ejected from the cylinders 282 upon the valve-like piston 284 moving to the left is ejected by the ball check. valve 21I before entering the conduit 54 to the cylinder of the internal combustion engine.

' The valve sleeve 281 extends to the right and is v provided upon its. right-hand endwith a socket 1 215 which receives an actuating member 218 op- I erated'by a wheel 214 by a rotating plate 219. The wheels 214 are constrained against the rotating plate by means of springs 211 positioned inside of the actuating members 218. As shown best in 1 Figures 3 and 4, the rotating plate 218 is provided I with a circular race-way 218 having a raised por-.

tion or cam 288 which when a wheel 214 rides 1 thereover actuates an actuating member 218 to the left. when the left-hand end of the actuating I members 218 engage the bottom of a socket 215,

the movement of the wheel 214 is transmitted to the valve sleeve 281, preparatory to ejecting the I fluid from the cylinders 282,. The rotating plate I 219 is driven by a drive shaft 28I which may be rotated by any suitable motive power means as indicated by the reference character IN. The drive. shaft is sealed by means of a shaft seal 282.

A ball bearing 283 supports the drive shaft 28I and a thrust bearing 284 prevents axial movement of the drive shaft 28I to the right. The valve stem 288 is controlled by a position- 'able plate 281 having fingers 288 extending radiplunger I88 which in turn is controlled by a pilot plunger I85 having pilot valve openings I88. The pilot plunger I85 is governed by a pilot piston I88 by a master valve I51 which is a part of the motion transmitting means 228 shown in Figure 1. The master valve I 51 controls the pilot piston I88 as will be explained later. The shaft I19 of the motion transmitting means 228 has a pinion gear I88 anchored on the end thereof and is arranged to mesh with rack teeth I8I for holding the pilot plunger I88 in a fixed position when the master valve I51 is in its neutral or normal position. The housing I 58 of the motion transmitting means 229 is provided with a flange 388 and is arranged to be connected to the housing 389 which encloses the pilot plunger I85 and which is connected to the central body portion of the housing 28I of the liquid metering device 58. Fluid under pressure from the pump is admitted to the master valve I51 through a pipe I99 and the flow of the fluid to and from the master valve I51 to the opposite side of the pilot piston I88 is caused to pass through ducts 282 and 283. The rollers I88 and the shaft I88 that control the slidable and rotatable position of the plunger I58 of the master valve I51 are actuated by a gear 3I8 which meshes with the rack teeth 9 I 1 having the .ends thereof respectively connected'to the pressure actuating devices I45 and I48 The pressure responsive device I45 is connected to the low pressure side of the venturi 288 in the feed pipe 259 through a pipe I41 and the ally therefrom for engaging the 'caps 281 which I rest upon the right-hand ends of the valve stems 288. The caps 291 are anchored to the valve stems 288 and springs 292 are arranged to bias the valve stems 288 to the right. The positionable 1 plate 281 is connected to a follower plunger I98 by means of a shaft 289. Springs 298 are provided to urge the valve sleeves 281 to the right. The shaft 289 is sealed from the follower plunger I98 by means of a shaft seal 283. The shaft seal is constrained against the shaft by means of a spring 298 which resides between a movable cap I 38I and a threaded cap 388. The position ofthe positionable plate 281 is governed by the follower pressure responsive device I48 is connected to the high pressure of the venturi 288 through a pipe I48. The differential pressure between the two responsive devices I45 and I48 is a function of the quantity of liquid or fuel flowing from the pump 58 to the metering device 53 but for the rotating movements of the shaft I18 which holds the pilot plunger I in a fixed positionis a function of the stabilized flow of the fluid through the pipe 259 into the liquid metering device 53. Inasmuch as the motion transmitting means 228 is effective in producing a movement which corresponds to a function of the fluid through the venturi 288 and inasmuch as the motion transmitting means 228 controls the position of the follower plunger I98 as governed by the pilot valve openings I89, the position of the positionable plate 281 is likewise governed by the fluid flowing through the venturi 288. The position of the positionable plate 281 controls the point at which the valve 285 upon the left-hand end of the valve stem 288 close to begin to eject fuel from the cylinders'282. In other words, it is not until the valve sleeve 281 engages the valve 285 that the fluid is entrapped in the cylinders 282 at which point the ejection is initiated for measuring the quantity of fuel ejected by each movement of the valve-like piston 284. The farther that the positionable plate 281 is to the right the larger the volume of liquid ejected upon each reciprocal movement of the valve-like piston 284. That is to say, it is not until the caps 291 are pulled away from the fingers 288 of the positionable plate 281 that the valve 285 is closed which initiates the ejection action of the valve-like piston 284.

The shaft I24 which is responsive to the differential pressure between the two bellows I45 and I48 and the movement of the shaft I24'is arranged through the motion transmitting means 228 to govern the position of the positionable plate 281 and the flow of liquid from the metering device. The flange I5I on the uppermost portion of the housing I58 of the motion transmitting means 228 is arranged to be connected to the bottom of the bracket which supports the two bellows I45 and I46. Asillustrated, ashaft seal I52 seals the housing I50 from the outside. The lower end of the shaft I24 i arranged to be supported by a ball bearing I53 and the upward axial movement of the shaft I24 is opposed by a thrust bearing I54. Anchored to the lower end of the shaft I24 is a hollow spline I55 which slidably receives a shaft spline I56 to which is attached a shaft I60 that actuates a slidable and rotatable plunger I59 within a rotatable casing I58. The slidable and rotatable plunger I59 is urged downward by means of a spring I 6I acting against a spring plate I62 which is constrained against the slidable and rotatable plunger I59 through ball bearings I63. By this construction the slidable and rotatable plunger I59 may rotate relative with the spring plate I62 without any friction because the ball bearings I63 provide a minimum amount of friction therebetween. The spring I6I upon its uppermost end rests against the underneath side of the upper end portion I64 of the rotatable casing I58. The upper side of the upper end portion I94 i provided with an annular race way surface I65 against which rides two diametrically opposed rollers I66 which are carried by the shaft I60. The master valve I51 is shown in Figures and 14, inclusive, and as there illustrated, the annular race way surface I65 is provided with two diametrically opposed low points I61 into which the rollers I66 reside in their normal'and neutral position. The upper side of the upper end I64 of the rotatable casing I58 is likewise provided with annular gear teeth I10 which are engaged by a gear I1I actuated by a shaft I12 driven by the throttle device 38. The throttle shaft I12 is surrounded by a shaft seal I13 to keep the internal compartment of the master valve I 51 sealed from the outside. The shaft seal I13 is held in place by means of a threaded lock nut I15. A threaded cap I14 protects'the shaft seal and the lock nut I15 from outside exposure. The outside of the rotatable casing I58. is slightly tapered in an upward direction and flts into the housing I50 .which likewise has a complementarily tapered internal surface to receive the rotatable casing. As shown, the rotatable casing is urged upwardly into the housing I50 byv means of a spring I16 that has its upper end resting against the bottom end I11 of the rotatable casing I58. The lower end of the spring rests against a plate I84 that closes the lower end of the housing I 50. Positioned on the bottom of the slidable and rotatable plunger I59 is a clutch I18 having two disc parts which when engaged provide for restraining a shaft I18 which has a pinion gear I80 at the I itself with the pilot valve openings I89 at which I93 together with the pilot plunger I85 may be characterized as a fluid pressure follower device which actuates the positionable plate 281. The follower plunger I90 is constrained to the right by means of a spring I9I. Extending longitudinally of the follower plunger I90 is a restricted opening I92 which permits fluid to move from the right-hand end of the cylinder casing I93 to the left-hand en thereof. Fluid under pressure is admitted to the cylinder casing I93 through the fluid inlet 294. The pilot valve openings I89 which comprise radial openings in the pilot plunger I85, provide for determining the position of the follower plunger I90 which actuate the positionable plate 281. In a stabilized position of the follower plunger, the fluid pressure acting upon the lefthand end'thereof, together with the exertion of the spring I9I just balances the pressure of the fluid acting upon the right-hand end of the follower plunger. pilot valve openings I89 are moved to the left upon the movement of the pilot plunger I85 to the left, then the fluid in the left-hand end of the cylinder casing I93 is permitted to escape through the pilot valve openings I89 and thence out through the opening 20I in the left-hand end of the pilot plunger I85 to the exhaust fluid outlet 200 whereupon the fluid flows back to the supply tank 206 as shown in the diagrammatic view in Figure 1 of the drawings. The escape of the fluid from the left-hand end of the cylinder casing I93 through the pilot valve openings I69 causes a fluid pressure drop and as a consequence the follower plunger I90 i urged to the left by the fluid pressure in the right-hand end of the cylinder casing I93. The follower plunger I90 moves to the left until the left-hand end thereof aligns place the follower plunger again becomes stabilized. Under the condition that the pilot valve openings I 89 should be moved to the right, in

I which event the fluid within the left-hand end of lower end thereof meshing with a member having rack teeth I8 I. The shaft I19 is provided with a thrust plate I82 formed integrally therewith or otherwise suitably connected thereto and the thrust plate I 82 is arranged to prevent axial move-, ment of the shaft I19. One side of the thrust plate rests in the recess formed in the bottom end I11 of the rotatable casing I58 and the other side I of the thrust plate I82 rests against a, threaded I8I with the result 281 is maintained in a fixed position forcontrolling the flow of the liquid to'the internal combust a cylinder casing I93 is totally entrapped therein, then the pressure within the left-hand end of the cylinder casing I93 together with the force of the spring I9I is greater than the pressure exerted by the fluid in the right-hand end of the cylinder casing I93 with the result that the follower plunger I 90v moves to the right until the left-hand edge thereof, again becomes substantially aligned with the pilot valve openings I89. Consequently, the movement of the follower plunger I90 follows the movement of the pilot plunger I85, and the movement is such that the left-hand edge of the follower plunger I90 is always maintained in substantial alignment with the pilot valve openings I89. When the master valve I 51 is in its neutral or normal position, that is, the position when the rollers I66 are residing in the low point I61 of the annular race way surface I65, the two engaging discs of the clutch I18 hold the pilot plunger I85 in a, fixed position through the pinion gear I and the rack teeth that the positionable plate tion engine. The master valve I51 controls the position of the pilot plunger I by governing the flow of the fluid which is admitted to opposite sides of the pilot piston I96 within the pilot, cylinder I91. Fluid is admitted under pressure through the fluid inlet I99 to the master valve I51 and through control ports within the master valve I51 fluid is admitted to or exhausted from the pilot cylinder Now let it be assumed that the l81 through the fluid ducts 202 or 203. The control of the fluid through the ports within the master valve I51 may best be explained by reference to Figures 5 to 13, inclusive, which show cross-sectional views of the master valve for the various positions which it is caused to assume by the rotation of the shaft I24 from the bellows I45 and I48 or by the shaft I12 from the throttle device 38. The right-hand end of the pilot cylinder I91 is sealed about the shaft by means of a shaft unit 205. In the operation of the master valve it is to be remembered that the rotatable casing I58 i arranged to be rotated with reference to the slidable and rotatable plunger I59 by means of a gear I'll driven by the throttle device 38, and further it is to be remembered that the slidable and rotatable plunger I59 is both reciprocated and rotated with reference to the rotatable casin I58 through means of the shaft I24. The Figure 5 shows a cross-sectional view of the master valve which is perpendicular to the view shown in Figure 1 and the Figure 6 shows a cross-sectional view taken along the line 88 of Figure 5 but the outside housing I50 is removed, the main object in showing the Figure 6 is to show the relative angular position with respect to the slidable and rotatable plunger I59 with respect to the rotatable casing, I 58. In the neutral position of the master control valve I51 as shown in Figures 5, 6. and- '1, fluid is admitted through the fluid inlet I99 whereupon it flows toan annular groove 233 provided in the housing I50. The rotatable casing I58 is provided with an opening 234 which admits the fluid to flow into the annular groove 235 around the slidable and rotatable plunger I59. From the annular groove 235 fluid flows through -a port 238 into the space upon the right-hand end of the slidable and rotatable plunger I59, after which the fluid may flow through the opening 231 in the bottom end I11 of the rotatable casing I58 and thence throughthe opening 238 out through the fluid outlet 200 whereupon the fluid flows through the supply tank 208, see Figures 1, 5, 6, and 7. From the compartment on the right-hand end of the slidable and rotatable plunger I59 the fluid may flow through the port 239 to the left-hand end of the slidable and rotatable plunger I59 and then out through a port 249 in the rotatable casing I58 to an annular groove 245 in the housing I 50, after which'the fluid flows through the duct 202 to, the righthand side of the pilot piston I98. Fluid may also flow to the left-hand side of the pilot piston I98, through a fluid circuit which may be traced as follows: Beginning with the port 239 which extends longitudinally through the slidable and rotatable plunger I59, fluid flows into the annular groove 240 and a hole 248 to an annular groove 248 in the housing I50 after which the fluid flows through the duct 203 to the left-hand-side of the pilot piston I98. There is substantially no pressure of the fluid on' opposite sides of the pilot piston I98 when the master valve I51 is in its neutral or normal position since :the fluid may exhaust through the fluid outlet 200. Accordingly, in the neutral or normal position the rack teeth I8I and the pinion gear I80 through the engagement.

of the clutch I18 hold the pilot plunger I85 in a fixed position which in turn means that the positionable plate 281 is held in a fixed position.

Now let it be assumed that the shaft I24 causes the rollers I88 to be turned'in a counter-clockwise y direction, thereby turning the slidable and rotatrollers I88 are turned in a counter-clockwise direction, they turn on the annular race way surface I85 and as they leave the low point I81 they constrain the slidable and rotatable plunger I59 to the left against the spring I8I and at the same time separate the two disc plates of the clutch I18 which permits the free turning of the pinion gear I80 and the free movement of the'rack teeth I8I, so that the pilot'plunger I85 may be actuated by the pilot piston I98. Under the above assumed condition, fluid is admitted to the righthand side of the pilot piston I98 for actuating the pilot plunger I85 to the left which means that the follower plunger I90 is likewise hydraulically moved to the left for moving the positionable plate 281 and the metering pistons 284 toward their minimum volume position. Fluid flows to the right-hand side of the pilot piston I98 through a fluid circuit which may be traced as follows: beginning with the fluid inlet I99 of Figure 8, fluid flows through the annular groove 233 and a hole 234 to the annular groove 2, after which fluid flows through the port 242 which extends longitudinally of the slidable and rotatable plunger I59 to a semi-annular groove 243 in the slidable and rotatable plunger I59, see Figure 10. From the semi-annular groove 243 fluid flows through a hole 249 in the rotatable casing I58 to the annular groove 245 after which the fluid flows through the duct 202 to the righthand side of the pilot piston I98 forurging the pilot plunger I85 to the left. The fluid on the left-hand side of the pilot piston I98 is exhausted through the outlet 200 to a circuit which extends from the left-hand side of tne pilot piston I98 through the duct 203 through the annular groove 248 in the casing I50, see Figures 1 and 10. From the annular groove 248 fluid flows through the hole 248 to the semi-annular groove 244 in the slidable and rotatable plunger I59, after which the fluid flows through the port 239 to the space on the right-hand end of the slidable and rotatable plunger I59, whereupon the fluid flows to the exhaust fluid outlet 200 through the openings 231 and 238, see Figure 1.

- left through the fluid pressure follower mechanism repositions the metering pistons 284 which in turn change the amount of the liquid flowing in the engine 33.; The repositioning of the metering pistons 284 is moved to such point that the bellows I45 and 148 rotate the two rollers I88 clockwise'back to the low point I81 in the annular race way surface I85 at which point the spring 'I8I urges the'slida'ble' and rotatable plunger I59 downwardly in Figure 1 and causes the two 'discs of the clutch I18 to re-engage for holding the pilot plunger I85 in a fixed position through the pinion gear I and the rack teeth I8I. Accordingly, the combined action of my opposing bellows, the master valve I51, and the fluid pressure follower mechanism is suchthat in the event the quantity of the liquid flowing through the duct 259 changes, the metering pistons 284 are repositioned to cause the quantity of liquid to be maintained at a predetermined value or setting as determined by the throttle device 38.

bellows to rotate the shaft I24 in a clockwise direction which is just the reverse from that shown in Figure 9, then. the pilot piston I98 is actuated to the right which in turn through the fluid pressure follower mechanism increases the volume delivery of the metering pistons 284.

The flow of the fluid to the left-hand side of the piston I96'may be'traced as follows; beginning groove 24I of the slidable and rotatable plunger.

I59 into the port 242, whereupon the fluid flows to the semi-annular groove 250, the hole 248, the annular groove 246, and the duct 203 to the lefthand side of the pilot piston I96. As the "pilot piston I96 moves to the right the fluid in the right-hand end of the pilot cylinder I91, is exhausted out through the fluid outlet 200 to a circuit which extends as follows: beginning with the right-hand end of the pilot cylinder I91, fluid flows through the duct 202, the annular groove 245 inthe housing I50, the hole 249 to the semiannular groove 25I after which the fluid flows hand side of the pilot piston I96 for increasing the volume delivery. The effect produced by rotating'the rotatable casing I58 is such as to through the port 239 and the openings 231 and 238 to the fluid outlet 200. From the above description it is observed that the rotation of the slidable and rotatable plunger I59 in a counterclockwise direction with reference to the rotatable casing I58 causes the pilot piston I96 to be actuated to the left and the rotation of the slidable and rotatable plunger I59 in a clockwise direction with reference to the rotatable casing I58 causes the pilot piston I96 to be actuated to the right. flow of fluid to take care of the two-way operation of the pilot piston I96 is effected through the rotation of the slidable and rotatable plunger I59 whereupon the semi-annular grooves 243,

The change in th direction of the v combination, a plurality of cylinders, a plurality change the setting of the master valve I51 to produce a corresponding repositioning of the metering pistons.

Consequently, the amount of fluid ejected from the cylinders 262 upon each reciprocal movement 0f the valve-like piston 264 is controlled by the throttle device 38. In addition, the differential action of the pressure responsive devices I45 and I46 maintains the volume of each ejection of the valve-like piston 264 in accordance with the amount of fluid flowing through the venturi 260. The flow of the fluid from the venturi to the pressure responsive device I45 is through a duct I41 and the flow of thefluid to the pressure responsive device I46 is through a duct I48.

Although I have described my invention with a certain degree of particularity, it is understood that the present disclosure has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

I claim as my invention:

1. A liquid metering device comprising, in

of pistons therefor, valve'means having a seat part and a closure part therefor carried by the pistons, means for actuating the pistons, and

244, 259, -25I are caused to be aligned with the I holes 248 and 249 in the rotatable casing I58. The slidable movement of the slidable and rotatable plunger I59 takes care of matching of the annular grooves 235 and 24I in the slidable and rotatable plunger I59 with the port 234 of the rotatable casing I58. An annular groove 240 is provided between the semi-annular grooves so that fluid which escapes from the semi-annular grooves along the rotatable casing I58 may flow into the annular groove 240 and the port 239 to exhaust. The actionof the master valve is such that the metering pistons 264 are governed to maintain the flow of the fuel through the liquid ducts 54 to'the engine 33 at a predetermined value or setting as determined by the throttle 36. The movement of the throttle 38 to a new position rotatesthe gear HI and shifts the angular position of the rotatable casing I58 with respect to the slidable and rotatable plunger I59, which in turn causes the master 'valve I51 to admit fluid to the pilotgylinder I91 for repositioning the metering pistons 264 through the fluid pressure follower mechanism. The Figures 11, 12, and 13 show the relative position of the rotatable casing I 58 and the slidable and rotatable plunger I59, after the rotatable casing l58 has been rotated in a clockwise direction as indicated by the arrow in Figure 12 by the throttle device 38. The rotation of'the rotatable casing .158 with ,respect to the slidable and rotatable plunger I59 produces the same result so far as, the alignment of the various grooves and parts in the master valveds concerned," as if the slidable and rotatable plunger I59 were rotated with respect to the rotatable casin I 58. Upon the rotation of the rotatable casing I58 in one direction, fluid is admitted to the right-hand side of the pilot piston I96 for reducing the volume delivery of {the metering pistons 264 and upon the rotation of the rotatable casing I56 in the opposite direction the master valve admits fluid through the leftadjustable means for controlling the operation wof the valve means to govern the quantity of liquid ejected upon the movement of the pistons in v the cylinders,

2. -A liquid metering device comprising, in com-- bination, a plurality of cylinders, a plurality of pistons therefor, each of said pistons being hollow and having valve means thereon including a. seat part and a closure part therefor, a valve and valve stem slidably fitting in each of the hollow pistons and connected to the said closure part, therein, means for actuating the pistons through a predetermined cyclic stroke, and positionable means for operating the valve stem to seat the said closure part on said seat part valve at some point during the ejection stroke 'of the pistons to govern the ejected. I

- 3. A liquid metering device comprising, in combination, a plurality of cylinders, a plurality of pistons therefor, each of said ,pistons being hollow and having valve means thereon including a seat part and a closure part therefor, a valve and valve stem slidably fitting in each 01' the hollow pistons and connected to the said closure part, therein, means for actuating the pistons through a predetermined cyclic stroke, positionable means for operating the valve stem toseat the said closure part on said seat part valve at some point during the ejection stroke of the pistons to govern the quantity of the liquid ejected, and means for operating the positionable means.

4. A liquid metering device comprising, in com- ,bination, a plurality of cylinders, a plurality oi.

through a predetermined cyclic stroke, positionquantity of the liquid able means for operating the valve stem to close the valve at some point during the ejection stroke.

of the pistons to govern the quantity of the liquilz ejected, means for operating the positionab means through said predetermined cycle, valve means for each of the ejecting means, and positionable means for operating the valve means at some point during the cycle of operation to govern the quantity of the liquid ejected.

6. A liquid metering device comprising, in combination, a plurality of variable volume liquid.

ejecting means having a predetermined cycle of operation, means for actuating the ejecting means through said predetermined cycle, valve means for each of the ejecting means, positionable means for operating the valve means at some point during the cycle of operation to govern the quantityof the liquid ejected, andmotion transmitting means having at least two operable control means for controlling the positionable means, said motion transmitting means having a resultant movement responsive to said at least two operable control means for governing the positionable means.

7. A liquid metering device comprising, in combination, a plurality of variable volume liquid ejecting means having a predetermined cycle of operation; means for actuating the ejecting means through said predetermined cycle, valve means for each of the ejecting means, positionable means for operating the valve means at some point during the cycleof operation to govern the quantity of the liquid ejected, motion transmitting means having at least two operable control means for controlling the positionable means, said motion transmitting means having a resultant movement responsive to said at least two operable control means for governing the positionable means, and clutch means for connecting the positionable means to one of said at least two operable control means.

8. A liquid metering device comprising, in combination, a plurality of variable volume liquid ejecting means having a predetermined cycle of operation, means for actuating the ejecting means through said predetermined cycle, valve means for each of the ejecting means, positionable rneans for operating the valve means at some point during the cycle of operation to govcm the quantity of the liquid ejected,flrst control means, operable control means, fluid pressure follower means for governing the moving and the repositioning of the positionable means, fluid valve means including a fluid valve for controlling the fluid pressure follower means, said fluid valve having two relatively movable parts, means for actuating one of said Parts by the first means, means for actuating the other of said valve parts by the operable control means,

disengageable means actuated by saidone of said valve parts for also governing the fluid pressure means for each of the ejecting means, positionable means for operating the valve means at some point during the cycle-of operation to govern the quantity of the liquid ejected, first control means, operable control means, fluid pressure follower means for governing the moving and the repositioning of the positionable means, a pilot valve for controlling the fluid pressure follower means, an actuating fluid device for actuating the pilot valve, a master fluid valve for governing the actuating fluid device and the fluid pressure follower means, said master valve having two relatively movable parts, means for actuating one of said valve parts by the-first means, and means for actuating the other of said valve parts by the operable control means.

10. A liquid metering device comprising, in combination, variable volume liquid ejecting means having a predetermined cycle of operation, means for actuating the ejecting means through said predetermined cycle, valve means for the ejecting means, and positionable means for operating the valve means at some point during the cyclic movement to govern the quantity of the liquid ejected.

11. A liquid metering device comprising, in combination, a plurality of cylinders, a plurality of pistons therefor, each of said pistons being hollow and having a valve and valve stem slidably fitting therein, means for actuating the pistons through a predetermined cyclic stroke, positionable means for operating the valve stem to close the valve at some point during the ejection stroke of the pistons to govern the quantity of the liquid ejected, and means responsive to the quantity of the fluid flowing to the liquid metering device for operating the positionable of the pistons to govern the quantity of the liquid ejected, means responsive to the quantity of the follower means, and means for disengaging the disengageable means upon movement of said one of said valve parts.

9. A liquid metering device comprising, in combination, a plurality of variable volume liquid ejecting means having a predetermined cycle of operation, means for actuating the ejecting means through said predetermined cycle, valve fluid flowing to the liquid metering device for operating the positionable means, and throttle means for also governing the positionable means.

13. A liquid metering device comprising, in combination, a plurality of variable volume liquid ejecting means having a predetermined cycle of operation, means for actuating the ejecting means through said predetermined cycle, valve means for each of the ejecting, means, positionable means ior operating the valve means at some point during the cycle of operation to govern the quantity of the liquid ejected, motion transmitting means having at least two operable control means for controlling the positionable means, said motion transmitting means having a resultant movement responsive to said at least two operable control means for governing the positionable means, one of said operable control means including means responsive to the flow of liquid ejected, and clutch means interconnecting the positionable means with the said responsive means. 1

THOMAS A; BAKER. 

